package com.platform.common.utils;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;


/**
 * 加密解密工具
 * @author wangLc
 */
public class EncryUtils {
	
      /**
       * 加密方法
       * @param content
       * @param password
       * @return
       */
	public static byte[] encrypt(String content, String password) {
        try {
            KeyGenerator kgen = KeyGenerator.getInstance("AES");
            SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
            random.setSeed(password.getBytes("utf-8"));
            kgen.init(128, random);
            SecretKey secretKey = kgen.generateKey();
            byte[] enCodeFormat = secretKey.getEncoded();
            SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
            Cipher cipher = Cipher.getInstance("AES");// 创建密码器
            byte[] byteContent = content.getBytes("utf-8");
            cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
            byte[] result = cipher.doFinal(byteContent);
            return result; // 加密
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 解密
     * @param content待解密内容
     * @param password解密密钥
     * @return
     */
    public static byte[] decrypt(byte[] content, String password) {
        try {
            KeyGenerator kgen = KeyGenerator.getInstance("AES");
            SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
            random.setSeed(password.getBytes("utf-8"));
            kgen.init(128, random);
            SecretKey secretKey = kgen.generateKey();
            byte[] enCodeFormat = secretKey.getEncoded();
            SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
            Cipher cipher = Cipher.getInstance("AES");// 创建密码器
            cipher.init(Cipher.DECRYPT_MODE, key);// 初始化
            
            byte[] result = cipher.doFinal(content);
            return result; // 加密
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        }catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 将二进制转换成16进制
     * @param buf
     * @return
     */
    public static String parseByte2HexStr(byte buf[]) {
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < buf.length; i++) {
            String hex = Integer.toHexString(buf[i] & 0xFF);
            if (hex.length() == 1) {
                hex = '0' + hex;
            }
            sb.append(hex.toUpperCase());
        }
        return sb.toString();
    }

    /**
     * 将16进制转换为二进制
     * @param hexStr
     * @return
     */
    public static byte[] parseHexStr2Byte(String hexStr) {
        if (hexStr.length() < 1)
            return null;
        byte[] result = new byte[hexStr.length() / 2];
        for (int i = 0; i < hexStr.length() / 2; i++) {
            int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
            int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
            result[i] = (byte) (high * 16 + low);
        }
        return result;
    }

    /**
     * 加密
     * @param content：需要加密的内容
     * @param password：加密密码
     * @return
     */
//    public static byte[] encrypt2(String content, String password) {
//        try {
//            SecretKeySpec key = new SecretKeySpec(password.getBytes(), "AES");
//            Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding");
//            byte[] byteContent = content.getBytes("utf-8");
//            cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
//            byte[] result = cipher.doFinal(byteContent);
//            return result; // 加密
//        } catch (NoSuchAlgorithmException e) {
//            e.printStackTrace();
//        } catch (NoSuchPaddingException e) {
//            e.printStackTrace();
//        } catch (InvalidKeyException e) {
//            e.printStackTrace();
//        } catch (UnsupportedEncodingException e) {
//            e.printStackTrace();
//        } catch (IllegalBlockSizeException e) {
//            e.printStackTrace();
//        } catch (BadPaddingException e) {
//            e.printStackTrace();
//        }
//        return null;
//    }

    public static void main(String[] args) throws UnsupportedEncodingException {
//        String content = "我是shoneworn";
//        String password = "12345678";
//        // 加密
//        System.out.println("加密前：" + content);
//        byte[] encode = encrypt(content, password);
//        
//        //传输过程,不转成16进制的字符串，就等着程序崩溃掉吧
//        String code = parseByte2HexStr(encode);
//        System.out.println("密文字符串：" + code);
//        byte[] decode = parseHexStr2Byte(code);
//        // 解密
//        byte[] decryptResult = decrypt(decode, password);
//        System.out.println("解密后：" + new String(decryptResult, "UTF-8")); //不转码会乱码  
//    	String aaa = decrypt("986D0189ED7FDA4508FEE23616D8E9EB");
//        System.out.println(aaa);
    }
    

    /**
     * 加密方法
     * wangLc
     */
    public static String encryption(String content){
    	String password = "12345678";
    	 byte[] encode = encrypt(content, password);
    	 String code = parseByte2HexStr(encode);
    	 return code;
    }
    
    /**
     * 解密方法
     * wangLc
     */
    public static String decrypt(String code){
    	String content = "";
    	try {
    		String password = "12345678";
        	byte[] decode = parseHexStr2Byte(code);//将16进制转换为二进制
            // 解密
            byte[] decryptResult = decrypt(decode, password);
             content = new String(decryptResult, "UTF-8");
		} catch (Exception e) {
		}
      return content;
    }
    
     

}